Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c124d3c568e6150…

MALICIOUS

PDF

43.5 KB Created: 2020-08-12 08:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70eb3b2283c2b5c78ff4a2e26302fc84 SHA-1: 0ba4305e88059670809f1065296d9e7de9734232 SHA-256: 0c124d3c568e615032162bef19ebc9cb4ae77c891bba307f487b30931a535454
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to potentially malicious or redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or lead users to malicious content. The presence of a known malicious redirector URL further supports this. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=go%20verbs%20in%20spanish%20worksheet%20pdf
    • http://files.roam-sick.com/uploads/1/3/0/7/130775959/8641264.pdf
    • http://degozar.oshkoshmainstreetmusicfestival.com/uploads/1/3/0/7/130776177/lukepuwuxisofejar.pdf
    • http://miwunu.homecompanyservice.com/uploads/1/3/1/4/131406665/39751c.pdf
    • http://files.pitkincountyrivers.com/uploads/1/3/0/8/130873787/nufizotulenasikamo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/discord_dating_servers_13.pdf
    • https://cdn.shopify.com/s/files/1/0438/0209/9873/files/filepuminuzofejikew.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/94049158775.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/killjoy_goes_to_hell.pdf
    • https://cdn.shopify.com/s/files/1/0433/6726/8517/files/velutasun.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/doobie_brothers_another_park_another_sunday.pdf
    • https://cdn.shopify.com/s/files/1/0435/3690/8439/files/75051657584.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/historia_de_los_alimentos_transgenicos.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6760/files/26781181940.pdf
    • https://cdn.shopify.com/s/files/1/0439/1341/2760/files/business_english_tests.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e59.bin
2cee828fc20a315a209ab9f508689960710439aa27be998bffa25ddf21877f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E59 5272 bytes
font_01_sfnt_off0000704d.bin
c033afc94296128800394af1fc179ae456d56748991b1ce2251e210294bfca83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704D 10132 bytes
font_02_sfnt_off00009305.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9305 4324 bytes

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